Old Man's War by John ScalziStarship Troopers by Robert A. HeinleinEnder’s Game by Orson Scott CardOn Basilisk Station by David  WeberThe Forever War by Joe Haldeman
Space Opera & Military SF
469 books — 275 voters
Ender’s Game by Orson Scott CardStarship Troopers by Robert A. HeinleinOld Man's War by John ScalziThe Forever War by Joe HaldemanOn Basilisk Station by David  Weber
Best Military Science Fiction Books
711 books — 866 voters

Dune by Frank HerbertOld Man's War by John ScalziLeviathan Wakes by James S.A. CoreyStarship Troopers by Robert A. HeinleinPandora's Star by Peter F. Hamilton
Excellent Space Opera
1,031 books — 3,703 voters
Leviathan Wakes by James S.A. CoreyOld Man's War by John ScalziAncillary Justice by Ann LeckieRed Rising by Pierce BrownThe Long Way to a Small, Angry Planet by Becky Chambers
Best Space Opera of the 21st Century
291 books — 556 voters

Ready Player One by Ernest ClineThe Martian by Andy WeirOld Man's War by John ScalziThe Hunger Games by Suzanne CollinsLeviathan Wakes by James S.A. Corey
Best Science Fiction of the 21st Century
1,250 books — 9,003 voters